To all customers and partners which deployed 3CX using the PBX Express wizard using their own account please continue reading:
In order to streamline normal and PBX Express installs the repositories have been merge into one single install / update repository. Version 15.5 SP1 will be the last available version which will be shipped in the PBX Express repository. All instances created before 11/08/2017 need to have their source repository updated manually using SSH. The repository has to change to the 3CX MAIN repository in order for the instances to receive further updates.
From SSH as root or via sudo execute the following commands:
sudo echo "deb https://downloads.3cx.com/downloads/3cxpbx/ /" | sudo tee /etc/apt/sources.list.d/3cxpbx.list
sudo apt-get update